Chapter 20.3, Problem 20.5AFP

(a)

Interpretation Introduction

Interpretation:

The change in standard Gibbs free energy of reaction needs to be calculated for the given reaction at 298 K.

  $2\text{NO}\left(g\right)+{\text{Cl}}_{\text{2}}\left(g\right)\to \text{2NOCl}\left(g\right)$

Concept Introduction:

The change in standard Gibbs free energy of a reaction can be calculated using the change in Gibbs free energy of formation of reactant and products from the thermodynamic table (at 298 K).

The formula used is as follows:

  $\Delta G_{\text{reaction}}={\displaystyle \sum \Delta G_{\text{product}}}-{\displaystyle \sum \Delta G_{\text{reactant}}}$

(b)

Interpretation Introduction

Interpretation: The change in standard Gibbs free energy of reaction needs to be calculated for the given reaction at 298 K.

  ${\text{3H}}_{\text{2}}\left(g\right)+{\text{Fe}}_{\text{2}}{\text{O}}_{\text{3}}\left(s\right)\to \text{2Fe}\left(s\right)+{\text{3H}}_{\text{2}}\text{O}\left(g\right)$

Concept Introduction:

The change in standard Gibbs free energy of a reaction can be calculated using the change in Gibbs free energy of formation of reactant and products from the thermodynamic table (at 298 K).

The formula used is as follows:

  $\Delta G_{\text{reaction}}={\displaystyle \sum \Delta G_{\text{product}}}-{\displaystyle \sum \Delta G_{\text{reactant}}}$